Having the grub menu working is also a minimal safety net when tempering with boot settings, so it makes sense to address this first if you see this too. After this, update-grub needs to be run (which the above dpkg-reconfigure will do as well). I recovered it by editing /etc/default/grub to contain GRUB_TERMINAL=console, GRUB_TIMEOUT_STYLE=menu, and GRUB_TIMEOUT=10. I fixed Failed to Set MokListRT: Invalid Parameter by following (a KDE Neon adapted version of) Shibiwan's answer on Ubuntu 20.04 Failed to Set MokListRT: Invallid Parameter.testing it with another device, such as a lamp. T EST THE ELECTRICAL OUTLET Ensure that the electrical outlet is working by. Doing this might have interacted with the effectiveness of my fix: Dell Inspiron 1521 130/222 If the display is difficult to read. I saw two more boot-level issues after the upgrade and I fixed them too. What else I did (may have interacted with the above fix) Both were applied before on my machine and remained active after the upgrade, so not related. Also, MacBook Air 3,2 by default may fail to boot usable graphics altogether in Nvidia drivers, which is fixed by setting certain PCI-E registers in grub as per Proprietary NVidia drivers with EFI on Mac, to prevent overheating. In particular, you need to add X-related device option settings EnableBrightnessControl=1 as per Brightness not working after installing NVIDIA driver. Note that Nvidia drivers on MacBook Air 3,2 have a whole set of other, unrelated issues, some specifically related to brightness control. KDE Neon, Nvidia video drivers, kernel 5.4.0-54-generic.Macbook Air 3,2 (very old, tends to have EFI boot issues related to graphics).brightness 0.8) allowed me to change brightness, but system keys still do not work and using xrandr resets screen colour (night colour mode) Renato Miotto's solution (via xrandr -output.Problem was as described above, first found after upgrade to Ubuntu 20.04 (brightness worked before).However, I add more details on my setup and what else I did below. Moreover, package names after dpkg-reconfigure auto-complete in my bash, but your settings may vary.ĭoing this should always be safe and quick, so it would not hurt to try this before you do anything else. If you are unsure, run uname -r to get the kernel name. Obviously, you should run this with the package of your current boot kernel. For me, the problem was solved by simply rebuilding the initrd another time after booting into the new kernel: sudo dpkg-reconfigure linux-image-5.4.0-54-generic
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